If you are using a WordPress.com theme good SEO is a given. However, going beyond the theme what the blogger has done within that structure is worth evaluating. Whether you write informative, persuasive or controversial content learning how search engines work, and how to apply basic SEO to you content will benefit your blog as it will increase traffic from targeted readers. http://onecoolsitebloggingtips.com/2011/10/21/two-seo-videos-for-bloggers/

Thanks for such a quick response and for all the links to check out. I saw there was a SEO plug in that could be installed to further enhance that aspect of my blog, but since I have a wordpress.com blog, I'm assuming it can't be used for my site?